Check valve for steam boilers



R. MCDOWELL.

CHECK VALVE FOR STEAM BOILERS.

(No Model.)

Patented June 16, 1885.

IN VEN TOR B J6? fimw WITNESSES W 3 6 WW I S ATTORNEY PETERS, Pmwmm w. Waminglmfl UNITED STATES PATENT GFFICE.

RICHARD MGDOiVELL, OF LAMBERTVILLE, NE? JERSEY.

CHECK-VALVE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 320,380, dated June 16, 1885.

Application filed August 7, 1884. (N0 model.)

To aZZ whom it may concern:

Be it known that 1, RICHARD MCDOWELL, ot' Lambertville, in the county of Hunterdon and State of New Jersey,have inventeda new and useful Improvement in Check-Valves t'or SteanrBoilers, 0t which the following is a specification.

This invention relates to check-valves for steanrboilers, and it has for its object to provide a boiler with a check-valve, which is located on the inner side of the shell of the boiler in order to be thoroughlyprotected against the escape of steam in cases of collision or from an y accidents that may occur to the feed-pipes. lleretofore all check-valves have been placed on the outside of the boiler-thatis, secured to the exterior side of the shell-and in cases of accident to the teed-pipes the valve-connection is broken at its weakest place, which is the point at which its connection is made to the boiler. The valve thereby becomes separated from the boiler,leaving it without any check to the escape of steam, thus endanger ing the lives of those in the immediate vicinity.

t will be understood that my improved valve is applicable to any kind of boiler or steam-generator, but by preference I have illustrated the valve as attached to a locomo tive or horizontal boiler.

In the accompanying drawings, which form part of this specification, Figure 1 represents a transverse vertical section through a portion of alocomotive-boiler, showing my improved cheek-valve as it appears when the flange B of the same is secured to the exterior side of the boiler-shell G. Fig. 2 represents a section similar to that of Fig. 1, illustrating my improved check valve when its flange B is secured to the interior side of the boiler-shell G, also showing an outside checlrvalve, O, as it will appear when used in combination with my inside checlevalve, which in some cases may be advisable, especially in high-pressure boilers. Fig. 3 also represents a. section similar to Fig. 1, showing myimproved'valve with its flange B secured to the interior side of the boilershell G, and provided with an interior extensioin'ifiof the teed-pipe i,so as to deliver the feed-water below the steam-space in any part of the boiler that may be desired.

The construction of my improved checkvalve is fully illustrated by the drawings, in which A represents a casting which is provided with a flange, B, and in which the valveseat 0 is formed.

a represents a gate-valve,which is hinged to the casting by means of the hanger a in such a manner as will admit of the valve being revolved on its seat when it is in position and without its being removed from the hanger. The valve a is provided on its under side with a socket, E, which is for the purpose of receiving or engaging with a tool, by means of which it can be properly ground and seated from the outside of the boiler without necessitating the removal of the valve or entering the boiler. The hanger ais provided at its upper end with a tip, a, which is for the purpose of coming in contact with theflange B or boiler-shell G, and therebypreventing the valve from being thrown too far open. The casting A is provided with a suitable guard, as illustrated atD,which crosses the upper end ofthe hanger a in such a manner as will preventthe hanger from becoming loose or disengaged from the casting should the rivet it become broken or useless.

It is my intention and preference that the flange B of the casting should be secured to the inside of the boiler-shell, as shown in Figs. 2 and 3, but it is not absolutely necessary so long as the valve-seat is inside of the circumferential line of the boilershell, or so long as the valve seat is inside of the point at which the connection is apt to be broken in case of accident to the feed-pipe. The flange B, therefore, being secured to the outside of the boilershell, as shown in Fig. i, does not in theleast respect reduce the safety and protection atforded by my valve, as in case of accident the feed-pipe would break at the point where it is joined to the casting A, thus leaving the valve perfectly intact.

The operation of my valve is the same as all other cheek valves-that is, theteedwater is forced by means of an injector or pump or any other suitable method through the feedpipe i in the direction of the arrow. Thet'orce ot' the water will raise the valve, and thus pass into the boiler When the force of water is stopped, the internal pressure will close the valve, and thus it remains until it again becomes necessary to feed the boiler.

IOO

It will be easily understood from a careful examination of the drawings that astrait-way valve similar to that shown at C, Fig. 2, could be used in place of the gate-valve, as described. In fact, a ch eck-valve of any practical construetioncan be used if located on the inside of the boiler, as described, and the results would be the same. I do not, therefore, confine myself to the use of any particular construction of valve, as it may be necessary to use valves of different constructions under different circumstances.

Having thus described my invention and its advantages, what I claim as new, and desire to secure by Letters Patent, is as follows: I 1. A gate-check valve located on the inside of the boiler, in combination with a feed-pipe, 1', and adapted to be operated by means of an injector or pumps in the manner specified.

2. A check-valve located on theinside of the boiler, in combination with an outsidecheckvalve adapted to be operated in connection ,therewith by means of injector or pumps, as

and for the purposedeseribed.

3. A check-valve located on the inside of the boiler, and adapted to be operated as described in combination with the feed-pipe 1', as specified, and for the purpose set forth.

4. Aeheck-val've provided with a socket, E, or suitable projection formed to engage with a tool inserted from the outside of the boiler for the purpose of grinding and seating said valve, as described and specified.

5. A check-valve attached to the interior side of the boiler, constructed of a casting, A, as herein described, and provided with the guard D, for the purpose of holding the hanger a in position should the bolt it become broken or detached, as set forth and specified.

6. A cheek-valve constructed as herein described, consisting of the casting A, provided with the flange B,guard D, and lip d, in combination with the hanger a and valve (1 provided with the socket 1*),for the purpose of grinding and seating said valve by means of a tool inserted from the outside of the boiler, all as and for the purpose herein specified and set forth. r

In testimony that I claim the foregoing improvement in checkvalves, as above described, I have hereunto set my hand this 4th day of August, 1884.

' RICHARD MGDOWELL.

Witnesses:

JAMES P. NiEMANN, ALBERT SNYDER. 

